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It's a Temperature Control Switch,Supply voltage: 5V,Output
Capacitance: Max Current 5A, Max Power 1000W,Temperature range: -15-70
°c,Directly connected to the power at the input, the output connect to
the
load directly, such as heaters, light bulbs, fans, etc., the temperature
probe connect to the place you want to control the temperature.

Feature:

Supply voltage: 5V

Output Capacitance: Max Current 5A, Max Power 1000W

Temperature range: -15-70 ℃

Control accuracy: 0.1 ℃

Setting Accuracy: 5 ℃

Default Temp Difference Setting : 2 ℃

Thermostat probe: NTC 3950 / B = 10K (waterproof type 1M)

Instructions for use:

1: Determine the mode

Heating mode: the 5th switch up
Cooling mode: the 5th DIP switch down

2: Set the temperature

Setting the desired temperature need to adjust the four DIP switch,
Please refer to the picture of "Temperature Control Setting".

3: Connect the circuit

Directly connected to the power at the input, the output connect to the
load directly, such as heaters, light bulbs, fans, etc., the
temperature probe connect to the place you want to control the
temperature.